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Dear Erie, What you need is the 'clone' method (help meeg/clone). You could see a usage example I'm e.g spm_eeg_crop. Best, Vladimir On 9 Jul 2014, at 17:59, Erie Boorman <[log in to unmask]> wrote: > Hello, I'm using SPM to analyse some LFP data which has been epoched using EEG lab. However I would like to modify the size of the data object in SPM, creating a new data object so that I can run SPM functions and methods on that new data object. To be more concrete, my data object is currently 56 channels, 23986 samples/trial, 75 trials. I would like to create two different data objects that are different sizes which basically take portions of the existing data object. Could somebody suggest how to do this? > > Many thanks in advance, > -Erie